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Sun-Earth-Moon
| Term | Definition |
|---|---|
| Rotation | the action of rotating around the axis |
| Revolution | the movement of one object going around another a central object |
| Orbit | the curved path of one object around a central object |
| Geocentric Theory | The theory that the Earth was the center of the universe |
| Heliocentric Theory | The theory that the sun was the center of the Solar System |
| Astronomy | The science of observing the sky |
| solar system | a sun with planets and other objects in orbit around it |
| coment | a mass of frozen gas, cosmic dust, ice crystals, and organic material whose orbit around the sun takes it outside the solar system |
| gravity | a force of attraction between two objects |
| astronomer | a scientist who studies stars |
| NASA | the National Aeronautics and Space Administration |
| axis | an imaginary line that runs through an object |
| tilt | the angle of the earths axis (27.5) |
| meteors | the streak of light that is produced when a meteor burns as it enters an atmosphere |
| constellations | an observed pattern of stars |
| vernal equinox | the equinox in spring, on about March 20 in the northern hemisphere |
| autumnal equinox | the equinox in autumn, on about September 22 |
| summer solstice | the solstice that marks the onset of summer, at the time of the longest day, about June 21 |
| winter solstice | the solstice that marks the onset of winter, at the time of the shortest day, about December 22 |
| telescope | an optical instrument used for viewing distant objects |
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